feat: add ethernet & TCP/IP stack

kernel/src/Net/NetConfig.hpp

@@ -0,0 +1,37 @@
+/*
+    * NetConfig.hpp
+    * Network configuration (static IP, gateway, etc.)
+    * Copyright (c) 2025 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+
+namespace Net {
+
+    // Pack an IPv4 address from four octets (in host visual order: a.b.c.d)
+    // Returns in network byte order
+    inline uint32_t Ipv4Addr(uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
+        return (uint32_t)a | ((uint32_t)b << 8) | ((uint32_t)c << 16) | ((uint32_t)d << 24);
+    }
+
+    // Get/set the local IP address (network byte order)
+    uint32_t GetIpAddress();
+    void SetIpAddress(uint32_t ip);
+
+    // Get/set the subnet mask (network byte order)
+    uint32_t GetSubnetMask();
+    void SetSubnetMask(uint32_t mask);
+
+    // Get/set the default gateway (network byte order)
+    uint32_t GetGateway();
+    void SetGateway(uint32_t gw);
+
+    // Check if a destination IP is on the local subnet
+    bool IsLocalSubnet(uint32_t destIp);
+
+    // Get the next-hop IP for a given destination
+    // Returns destIp if local, or gateway if remote
+    uint32_t GetNextHop(uint32_t destIp);
+
+}